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From | James prince <jsprince26@gmail.com> |
To | statalist@hsphsun2.harvard.edu |
Subject | st: repeated factor ANOVA |
Date | Tue, 2 Oct 2012 07:57:07 -0500 |
Hello, I am unsure how to set-up the following problem using the ANOVA command. Any help would be appreciated. I have data on 600 liver patients, 300 assigned to one of two treatment groups (TREAT). Each had 4 biopsy (one in each quadrant: UR, UL, LR, LL) and the concentration on an enzyme (Y) measured. I also have data for sex. I know that I can used XTMIXED to do this, but I need to use ANOVA Thank you in advance, Jim -------------------------------------------------------------------------------------- This is what I did: I first tried using a repeated ANOVA but got an error: . anova y treat liver sex subj, repeat(subj) could not determine between-subject error term; use bse() option Then, If I set it up as nested, I get a result, but I am not sure if it is correct. anova y treat liver sex/ subj|liver/ Number of obs = 696 R-squared = 0.7757 Root MSE = 2.7219 Adj R-squared = 0.5508 Source | Partial SS df MS F Prob > F -----------+---------------------------------------------------- Model | 8892.14113 348 25.5521297 3.45 0.0000 | treat | .032965724 1 .032965724 0.00 0.9670 liver | 2235.41594 3 745.138647 38.76 0.0000 sex | .048400013 1 .048400013 0.00 0.9600 subj|liver | 6593.27098 343 19.2223644 -----------+---------------------------------------------------- subj|liver | 6593.27098 343 19.2223644 2.59 0.0000 | Residual | 2570.83017 347 7.40873248 -----------+---------------------------------------------------- Total | 11462.9713 695 16.4934839 -------------------------------------------------------------------------------------------------------------- * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/